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Cable Protection Systems Frequently asked questions 1. Is all cable protection the same? No. There is high quality cable protection ranging from Rigiduct, through Suretwin to lower quality General Purpose duct. 2. Would you recommend general purpose duct? Depending on the installation, general purpose ducting can be a cost effective solution, however general purpose ducting does not have any specification, so for more critical applications a higher quality system should be used. 3. The spec says PVC cable protection, can I use Twinwall? Most probably, PVC tends to be used as a generic term for plastic, there are high quality PVC cable protection, most Twinwall cable protection, including Rigiduct and Suretwin are on a par with the higher specification PVC cable protection. 4. Do you make a full range of colours? Yes, please refer to the following pages. 5. What are the common sizes for access boxes? 290mm x 275mm, 300mm x 450mm, 450mm x 450mm, 450mm x 600mm, 600mm x 600mm, 290mm x 275mm and 450mm x 450mm pole boxes. All in single, double or triple height units. 6. Do you supply covers and frames to suit? Yes, composite and non locking, galvanised steel and ductile iron. 7. Can I install cable protection in a road? Yes, provided there is suitable cover or adequate protection is given to the cable protection. 8. Are there any installation details for access boxes? Yes, please refer to the following pages. 9. Is there any other manufacturer who makes both cable protection systems, access boxes, or who has a product range as extensive? No. BBA BRITISH BOARD OF AGRÉMENT CERTIFICATE No. 90/R049 BBA BRITISH BOARD OF AGRÉMENT CERTIFICATE No. 89/2175 BBA BRITISH BOARD OF AGRÉMENT CERTIFICATE No. 00/3678 BBA BRITISH BOARD OF AGRÉMENT CERTIFICATE No. 02/H068 BBA BRITISH BOARD OF AGRÉMENT CERTIFICATE No. 00/3678 BBA BRITISH BOARD OF AGRÉMENT CERTIFICATE No. 02/H068 BBA BRITISH BOARD OF AGRÉMENT CERTIFICATE No. 90/R049 BBA BRITISH BOARD OF AGRÉMENT CERTIFICATE No. 89/2175 BBA BRITISH BOARD OF AGRÉMENT CERTIFICATE No. 00/3678 BBA BRITISH BOARD OF AGRÉMENT CERTIFICATE No. 02/H068 BBA BRITISH BOARD OF AGRÉMENT CERTIFICATE No. 00/3678 BBA BRITISH BOARD OF AGRÉMENT CERTIFICATE No. 02/H068 A complete cable protection system for almost any application: • Power • Motorway comms • Lighting • Utilities • UPVC specification • General purpose • Installation advice 78 WWW.CABLEJOINTS.CO.UK THORNE & DERRICK UK TEL 0044 191 490 1547 FAX 0044 477 5371 TEL 0044 117 977 4647 FAX 0044 977 5582 WWW.THORNEANDDERRICK.CO.UK

104 All dimensions provided are nominal. Installation advice Installation information Ridgiduct Twin-Walled High Density Polyethylene cable protection must be installed in accordance with the general requirements and any additional site requirements. The general requirements are to be in accordance with MCHW, Volume 3, as shown below. Cable protection laid in depths of cover other than those specified below must be laid in accordance with the procedures described in the contract with the Highways Agency (HA). Ridgiduct must be adequately protected against damage from site construction traffic and from agricultural or similar operations. When used as cable protection for fibre optic cabling the recommendations in BS 7718 : 1996 should be followed. Procedure (unsealed) Joints are made by a simple push-fit of one cable protection length into the coupler attached to the adjacent length, ensuring that the connection is fully made. Inspection points can be made in the conventional manner depending upon the type of services to be installed. Access and pole box installation advice Polypipe Civils recommends that the systems be installed in general accordance with the Traffic Control Signals Unit (TCSU) specification. Polypipe access and pole boxes are designed to meet the requirements of the TCSU, making installation easy and trouble-free. Local specifications and requirements may apply. Covers and frames Access box covers and frames should meet the requirements of BS EN 124 Class B125. In carriageways or other locations where vehicles may run over access boxes, heavier grades of cover may be required. General In footways cable protection for signal post cables and linking cables must have minimum cover depths of 450mm and 250mm respectively. The minimum depth of cover in carriageways is 600mm. Subject to local cable protection specification, cable protection should be bedded on 100mm of compacted bedding material. Cable protection lengths must be continuous and fully jointed, with the printing placed uppermost when laying. Suitable surrround material should also be used to fill any voids between multiple cable protection and should extend to 100mm above the cable protection. Polypropylene draw cords should be provided in each cable protection with no knots or joints and should extend a minimum of 1 metre into each access box. Access and pole boxes Cable protection are easily connected to the selected entry point. The pre-trepanned section for the size of cable protection to be used can be cut out with a knife or hole saw. The cable protection should be inserted through the opening and cut to length. Boxes that may be subject to traffic loading are typically installed as illustrated. Typical installation of a 450 x 450mm access box subject to vehicle traffic Typical installation of a Polypipe 450 x 450mm pole box Tarmac Concrete Coarse Sand Type 1 Sub-base Type 1 Sub-base Tarmac Concrete

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